Make pathos run in the browser.

pkg/pathos/test/pathos_url_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-import 'dart:io' as io;
-
 import 'package:unittest/unittest.dart';
 import 'package:pathos/path.dart' as path;
 
 main() {
   var builder = new path.Builder(style: path.Style.url,
       root: 'http://dartlang.org/root/path');
 
   test('separator', () {
     expect(builder.separator, '/');
   });
@@ skipping 412 matching lines @@
       test('given relative path', () {
         // The path is considered relative to the root, so it basically just
         // normalizes.
         expect(builder.relative(''), '.');
         expect(builder.relative('.'), '.');
         expect(builder.relative('a'), 'a');
         expect(builder.relative('a/b.txt'), 'a/b.txt');
         expect(builder.relative('../a/b.txt'), '../a/b.txt');
         expect(builder.relative('a/./b/../c.txt'), 'a/c.txt');
       });
+
+      // Regression
+      test('from root-only path', () {
+        expect(builder.relative('http://dartlang.org',
+                from: 'http://dartlang.org'),
+            '.');
+        expect(builder.relative('http://dartlang.org/root/path',
+                from: 'http://dartlang.org'),
+            'root/path');
+      });
     });
 
     group('from relative root', () {
       var r = new path.Builder(style: path.Style.url, root: 'foo/bar');
 
       test('given absolute path', () {
         expect(r.relative('http://google.com/'), equals('http://google.com'));
         expect(r.relative('http://google.com'), equals('http://google.com'));
         expect(r.relative('file:///'), equals('file://'));
         expect(r.relative('file://'), equals('file://'));
@@ skipping 99 matching lines @@
 
       expect(r.relative('http://dartlang.org/foo/bar/baz', from: 'foo/bar'),
           equals('http://dartlang.org/foo/bar/baz'));
       expect(r.relative('file:///foo/bar/baz', from: 'foo/bar'),
           equals('file:///foo/bar/baz'));
       expect(r.relative('/foo/bar/baz', from: 'foo/bar'),
           equals('/foo/bar/baz'));
 
       expect(r.relative('..', from: 'foo/bar'), equals('../../..'));
     });
+
+    test('from a . root', () {
+      var r = new path.Builder(style: path.Style.url, root: '.');
+      expect(r.relative('http://dartlang.org/foo/bar/baz'),
+          equals('http://dartlang.org/foo/bar/baz'));
+      expect(r.relative('file:///foo/bar/baz'), equals('file:///foo/bar/baz'));
+      expect(r.relative('/foo/bar/baz'), equals('/foo/bar/baz'));
+      expect(r.relative('foo/bar/baz'), equals('foo/bar/baz'));
+    });
   });
 
   group('resolve', () {
     test('allows up to seven parts', () {
       expect(builder.resolve('a'), 'http://dartlang.org/root/path/a');
       expect(builder.resolve('a', 'b'), 'http://dartlang.org/root/path/a/b');
       expect(builder.resolve('a', 'b', 'c'),
           'http://dartlang.org/root/path/a/b/c');
       expect(builder.resolve('a', 'b', 'c', 'd'),
           'http://dartlang.org/root/path/a/b/c/d');
@@ skipping 34 matching lines @@
     expect(builder.withoutExtension('a/.'), 'a/.');
     expect(builder.withoutExtension('a/.b'), 'a/.b');
     expect(builder.withoutExtension('a.b/c'), 'a.b/c');
     expect(builder.withoutExtension(r'a.b\c'), r'a');
     expect(builder.withoutExtension(r'a/b\c'), r'a/b\c');
     expect(builder.withoutExtension(r'a/b\c.d'), r'a/b\c');
     expect(builder.withoutExtension('a/b.c/'), 'a/b/');
     expect(builder.withoutExtension('a/b.c//'), 'a/b//');
   });
 }